Circular saw



FIG. 1 is a top, front, left side perspective view of a circular saw showing the present design;

FIG. 2 is a top, front, right side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for a circular saw, as shown and described. 